Accession Number : ADA305049

Title :   Measurement and Modeling of Low Frequency Acoustic Wave Propagation and Scattering in Shallow Water with Comprehensive Subbottom Structure Measurements.

Descriptive Note : Final rept. 1 Oct 92-30 Sep 95,

Corporate Author : MIAMI UNIV FL INST OF MARINE AND ATMOSPHERIC SCIENCES

Personal Author(s) : Yamamoto, Tokuo

PDF Url : ADA305049

Report Date : 23 FEB 1996

Pagination or Media Count : 84

Abstract : A high resolution acoustic crosswell tomography technique was developed for accurate measurements of variabilities of density, velocity, shear strength and permeability within the sediments. An analytical expression for the three dimensional wave number spectra of these sediment properties has been obtained. Acoustics scattering from sediment volume has been obtained as a function of the three dimensional spectra of velocity and density variabilities. Work continues to quantify the relation between the variabilities of sediment properties and acoustic bottom scattering. A method to measure the ocean wave directional spectra using a single buried ocean bottom seismometer and a pressure senser has been developed and sea tested successfully.

Descriptors :   *UNDERWATER ACOUSTICS, *BOTTOM BOUNCE, PERMEABILITY, OCEAN WAVES, ACCURACY, HIGH RESOLUTION, THREE DIMENSIONAL, SHALLOW WATER, SPECTRA, TOMOGRAPHY, ACOUSTIC SCATTERING, SEDIMENTS, DIRECTIONAL, SHEAR STRENGTH.

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE